Uninstall your most recent EP then download and reinstall the digital version from Origin. Instructions here.
I updated my OS system to El Capitan and now my computer won't read my Into the Future Disc. I can't figure out how to de-install the latest expansion pack, so I could re-install it. My expansions are primarily discs with two of them as downloads. When I install the Into the Future back, is there a way I can do it without using the disc. All of my expansions show up under My Games in Origin. So I believe I registered all of my games, and the fact that Origin won't let me put in the serial numbers again, is another reason why I believe they're registered.
Please Help.
I've moved your post to this thread. Please read the opening post for further help.
